I like using cover flow view to figure out what I want to read next, because the visuals tend to trigger my memory of why I was interested in a book a lot more than just skimming titles. However, I have a lot of books in my library, and repeatedly tapping the arrow key to advance through the covers becomes literally painful after a while. But just holding the key down advances them so fast they're just a blur. I need something in between.

Is there any way to adjust the speed? Maybe something like "hold down [something] and arrow key together for 'slow scroll'"?